remove unused function
jshint fixes (missing semicolons etc)
Make initial water/sanitation choice configurable by URL

The options are

index.html?source=water
index.html?source=sanitation

and can be combined with other options
Merge branch 'master' into minified

* master:
  Make initial water/sanitation choice configurable by URL
  jshint fixes (missing semicolons etc)
  remove unused function
minify again